# ifthen
> If a condition is truthy, invoke `x`; otherwise, invoke `y`.
## Usage
```javascript
var ifthen = require( '@stdlib/utils/if-then' );
```
#### ifthen( bool, x, y )
If a condition is truthy, invokes `x`; otherwise, invokes `y`.
```javascript
function x() {
return 1.0;
}
function y() {
return -1.0;
}
var z = ifthen( true, x, y );
// returns 1.0
z = ifthen( false, x, y );
// returns -1.0
```
## Notes
- The function is similar to [`ifelse()`][@stdlib/utils/if-else], but allows deferred argument evaluation.
## Examples
```javascript
var randu = require( '@stdlib/random/base/randu' );
var ceil = require( '@stdlib/math/base/special/ceil' );
var repeatString = require( '@stdlib/string/repeat' );
var ifthen = require( '@stdlib/utils/if-then' );
var z;
var i;
function x() {
return repeatString( 'BOOP', ceil( randu()*3.0 ) );
}
function y() {
return repeatString( 'beep', ceil( randu()*5.0 ) );
}
for ( i = 0; i < 100; i++ ) {
z = ifthen( randu() > 0.9, x, y );
console.log( z );
}
```
[@stdlib/utils/if-else]: https://www.npmjs.com/package/@stdlib/utils/tree/main/if-else